Clean energy gets most of the limelight, but clean water is another tricky challenge for the 21st century. Venture capitalists know this, and are funding a range of water startups. Below is a few of the most promising and best funded.

Halo-Source, which provides purifying technology for developed and developing countries, just secured $11.5 million from Origo Sino India, Unilever Technology Ventures and others.

Energy recovery, an energy-efficient water desalination company, just broke a quarter-long drought of cleantech IPOs and raised $119 million on July 2.

Altela, a company that purifies the water extracted during oil and gas drilling, snagged $7.1 million from CCS Income Trust and other investors in May. Already, Altela is looking to raise a second round of funding to the tune of $26 million.

Clean Water Compliance, which sells a system for purifying stormwater runoff from construction and industrial sites before returning it to rivers and stream, raised $25 million last summer from Plainfield Asset Management.

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